I often do the same thing, camping a mile or more from water. However, during the day I carry only 1 liter between water sources, and "camel up" at each source. Then, at the last stop of the day, I pick up enough water to get to camp and make it to first water the next morning. For me, that's 3 liters: one and a half for overnight, half for breakfast, and a liter to go from last water to camp and camp to first water. So, instead of carrying all the water I need for the entire weekend (which is how I interpreted your first post), I carry one liter until about 3 or 4 in the afternoon, three liters (4 extra pounds) for a couple of hours, then back to one liter.